Size of collars: 16 inch 20 inch 24 inch 29 inch 32 inch 37 inch 40 inch 21 inch 26 inch 34 inch Small 14 inch 18 inch 28 inch 36 inch 38 inch large 17 inch 15 inch 19 inch 23 inch 31 inch 39 inch 25 inch 33 inch medium 22 inch 27 inch 30 inch 35 inch
Use: Search & Rescue For working dogs Training All weather Obedience training Police/Military K9 training Walking and daily use